<form #f="ngForm">
    <mat-form-field style="display: block;">
        <input matInput placeholder="快速建立一个任务" name="desc" [(ngModel)]="desc" required>
        <button matSuffix mat-iocn-button type="button" (click)="sendQuickTask()">
            <mat-icon>send</mat-icon>
        </button>
    </mat-form-field>
</form>